These Liquid Tight EMI / RFI - Proof Grounded Strain Relief Fittings made of nickel plated brass are the perfect answer to stringent requirements for reliable grounding and protection from electromagnetic interference (EMI). Two styles are available: STANDARD and FEED-THROUGH. The STANDARD version has an integral O-ring, which presses the braiding against the inside wall of the body but can only be used with braided shield - the FEED-THROUGH works well with braided or foil shield and provides reliable grounding by means of metal spring fingers.